Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
±5kV ESD
0.1µF
+5V
RTD SENSOR
OPEN
SHORT TO BAT
(16V)
SHORT TO GND
OPEN
SHORT TO BAT
SHORT TOGETHER
(16V)
SHORT TO GND
CHASSIS GND
VCC
RSRC
RS1+
ESD
CLAMP
RS1-
ESD
CLAMP
VCC
VCC
IEXC
HI-V
DETECT
MAX6603
AMP
FAULT
DETECT
RSRC
RS2+
ESD
CLAMP
AMP
RS2-
ESD
CLAMP
IEXC
HI-V
DETECT
FAULT
DETECT
OUT1
DG1
OUT2
DG2
0.1µF
ADC-REF VCC
ADC1
INPUT1
MICROCONTROLLER
ADC2
INPUT2
GND
Figure 2. The various fault conditions that cause the diagnostic output to assert low are shown for a single channel.
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